Cytosolic Cl- Affects the Anticancer Activity of Paclitaxel in the Gastric Cancer Cell Line, MKN28 Cell

Background/Aims: Our previous study revealed that cytosolic Cl- affected neurite elongation promoted via assembly of microtubule in rat pheochromocytoma PC12D cells and Cl-–induced blockade of intrinsic GTPase enhanced tubulin polymerization in vitro. Paclitaxel (PTX) is a microtubule-targeted chemotherapeutic drug and stabilizes microtubules resulting in mainly blockade of mitosis at the metaphase-anaphase transition and induction of apoptosis. In the present study, we tried to clarify whether the cytosolic Cl- affected PTX ability to inhibit cell growth in the gastric cancer cell line, MKN28. Methods: To clarify the cytosolic Cl- action on PTX-induced cell death and metaphase-anaphase transition in the gastric cancer cell line, MKN28 cell, and PTX-induced tubulin polymerization, we performed cell proliferation assay, cytosolic Cl- concentration measurement, immunofluorescence microscopy, and in vitro tubulin polymerization assay. Results: The decline of cytosolic Cl- weakened the cytotoxic effect of PTX on cell proliferation of MKN28 cells, which could pass through the metaphase-anaphase transition. Moreover, in vitro PTX-induced tubulin polymerization was diminished under the low Cl- condition. Conclusions: Our results strongly suggest that the upregulation of cytosolic Cl- concentration would enhance the antitumor effect of PTX, and that the cytosolic Cl- would be one of the key targets for anti-cancer therapy.

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